5.9 Magnum flywheel - DIY with bolt-on weight??

Yes the wieght I added is exacly opposite of where the holes are drilled on Idaho's flywheel. I don't have a camera that works but the 3 small holes drilled on the outer edge of my flywheel are actually in the exact opposite location as my added wieght.
At first I thought it was an external balance flywheel, then I realised I ran it on on my 318 for 2 years with no problems lol